Is it a babysitter or a day care??? My daycare is a never-ending battle with naps. After several meetings things are getting better. If it is daycare and there are other babies, you have to be extremely understanding to a point. 45 minutes is one sleep cycle and lo's are going to stir at the 45 minute mark. Couple that stirring with another lo screaming while they are playing and another lo bumping into your lo's crib because he or she is learning to crawl or walk and your lo is going to wake up.
1. Make sure that the caregiver is not just taking her out of the crib when she wakes. Make sure that they are at least trying to resettle. Let them know that if she wakes up crying she is still tired and that she is only to get up if she wakes up happy and content.
2. Recommend W2S to make naps longer (this worked for a bit)
3. Watch your lo's disposition. If she is coming home happy and with enough energy to spend enjoyable time with you at night, she is probably doing great with the short naps. Her consistent 11 hour sleep at night indicates that she is probably doing fine because as you no bad daytime sleep = bad nighttime sleep.
This is just a side note and I don't know if you have or will have this problem. My lo is on the chunkier side which may or may not have to do with him having NO desire at all to crawl (loves to stand and try to walk though). As a result, I think he often has some pint up physical energy even though he is metally tired iykwim (this is not a knock to the daycare people b/c I know they do a ton with him). Anyway, I donated a jumper to the daycare to help with the physcial part and he has started naping better b/c he is wearing himself out more.
Good Luck!